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Open AccessArticle

A Mass Balance Model for Designing Green Roof Systems that Incorporate a Cistern for Re-Use

Stormwater Management Academy, Department of Civil and Environmental Engineering, University of Central Florida, P.O. Box 162450, Orlando, FL 32816-2450, USA
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Water 2012, 4(4), 914-931; https://doi.org/10.3390/w4040914
Received: 18 September 2012 / Revised: 29 October 2012 / Accepted: 7 November 2012 / Published: 13 November 2012
(This article belongs to the Special Issue Sustainable Urban Water Management)
Green roofs, which have been used for several decades in many parts of the world, offer a unique and sustainable approach to stormwater management. Within this paper, evidence is presented on water retention for an irrigated green roof system. The presented green roof design results in a water retention volume on site. A first principle mass balance computer model is introduced to assist with the design of these green roof systems which incorporate a cistern to capture and reuse runoff waters for irrigation of the green roof. The model is used to estimate yearly stormwater retention volume for different cistern storage volumes. Additionally, the Blaney and Criddle equation is evaluated for estimation of monthly evapotranspiration rates for irrigated systems and incorporated into the model. This is done so evapotranspiration rates can be calculated for regions where historical data does not exist, allowing the model to be used anywhere historical weather data are available. This model is developed and discussed within this paper as well as compared to experimental results. View Full-Text
Keywords: green roof; stormwater retention; cistern; BMP; model; evapotranspiration; sustainability green roof; stormwater retention; cistern; BMP; model; evapotranspiration; sustainability
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MDPI and ACS Style

Hardin, M.; Wanielista, M.; Chopra, M. A Mass Balance Model for Designing Green Roof Systems that Incorporate a Cistern for Re-Use. Water 2012, 4, 914-931.

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